Rondo made a jumper with 36 seconds left in regulation to put the Celtics (20-19) up 86-84 and Boston held a two-point lead until the final 10 seconds. Chicago (23-15) forced a jump ball, won the tip and Kirk Hinrich hit a jumper to the tie the game with two seconds left. Boston couldn't convert at the other end, forcing overtime.
In overtime, a jumper by Jason Terry put the Celtics up one with 12 seconds left before Belinelli answered at the other end
Boston needed Rondo's offense with Kevin Garnett and Paul Pierce struggling shooting the ball. Rondo shot 12 for 21 while Pierce and Garnett combined to shoot just 10 for 33 and score 29 points. Jared Sullinger scored 15 points and had 13 rebounds off the bench.
The Bulls, who won their third straight game, led most of the game. Chicago had a five-point lead at halftime and held that lead entering the fourth quarter. The Bulls led despite an off game from Luol Deng, who scored just three points on 1 for 6 shooting and left the game in the third quarter after re-aggravating a hamstring injury.
Boozer finished with 19 points and 20 rebounds for Chicago and Richard Hamilton scored 20 points. Joakim Noah had 14 points and 13 rebounds. Jimmy Butler, who took over for Deng, scored 13 points off the bench.